Looking for software to make an Interior 3d Rendering
Just to add a real world testimony in addition to what is already sated in the comments.

Blender is perfectly capable (and quite good at it too) of doing realistic architectural renderings; I am an architect and happily use Blender for what you describe on a daily basis. 

You can import plans in DXF format directly from a CAD drawing using the default shipped in DXF imported addon.

As already mentioned before there is a well known steep learning curve compared to other software. It will requite effort and time from your part to learn it, and will also require additional time to get proficient with it.

If this is a one-off thing I am sad to say that Blender is probably not the software for you. The initial investment might just be too big for a single use and the difficulty too much to get you anywhere in a short time.

In that case Sketchup or other "lighter" software might be a better option.

If you plan on doing this in the long run and want to invest some time into it, then it might be very rewarding further down the road to endeavor in the Blender road.